Self-doped SrTiO3−δ photocatalyst with enhanced activity for artificial photosynthesis under visible light
Top Cited Papers
- 23 August 2011
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 4 (10), 4211-4219
- https://doi.org/10.1039/c1ee01594j
Abstract
Self-doped SrTiO3−δ was prepared through a carbon-free one-step combustion method followed by a series of heat treatments in Ar at temperatures ranging from 1200 to 1400 °C. X-Ray Photoelectron Spectroscopy (XPS), Electron Paramagnetic Resonance (EPR) and High-Resolution TEM confirm the presence of Ti3+ in samples with oxygen vacancy accommodated in perovskite by forming Ruddlesden–Popper crystallographic shears. The UV-vis spectra and electronic structure calculations show that the oxygen vacancy and Ti3+ together induce an in-gap band to enhance the visible light absorption. Pulsed Adsorption of CO2 and Temperature Programmed Desorption (TPD) experiments show that the higher oxygen deficiency tends to improve the chemical adsorption of CO2 on the surface as well as in the bulk of SrTiO3−δ, especially the accommodation of CO2 molecule in the oxygen vacancy. It is the synergetic effect of visible light absorption and chemical adsorption of CO2 that improves the artificial photosynthesis to generate hydrocarbon fuels from CO2/H2O under visible light irradiation. We also demonstrated that the incorporation of oxygen from CO2/H2O into the oxygen vacancy of SrTiO3−δ leads to the absence of oxygen evolution which therefore results in the oxidation of SrTiO3−δ (Ti3+ → Ti4+).Keywords
This publication has 41 references indexed in Scilit:
- Direct synthesis of methane from CO2/H2O in an oxygen-ion conducting solid oxide electrolyserEnergy & Environmental Science, 2011
- Electronic coupling assembly of semiconductor nanocrystals: self-narrowed band gap to promise solar energy utilizationEnergy & Environmental Science, 2011
- Tandem polymer photovoltaic cells—current status, challenges and future outlookEnergy & Environmental Science, 2011
- Ion-exchange synthesis of a micro/mesoporous Zn2GeO4 photocatalyst at room temperature for photoreduction of CO2Chemical Communications, 2011
- Electrochemical reduction of CO2 in a proton conducting solid oxide electrolyserJournal of Materials Chemistry, 2010
- High-Yield Synthesis of Ultralong and Ultrathin Zn2GeO4 Nanoribbons toward Improved Photocatalytic Reduction of CO2 into Renewable Hydrocarbon FuelJournal of the American Chemical Society, 2010
- An orthophosphate semiconductor with photooxidation properties under visible-light irradiationNature Materials, 2010
- A stable and thin BaCe0.7Nb0.1Gd0.2O3−δ membrane prepared by simple all-solid-state process for SOFCJournal of Power Sources, 2009
- Advanced Technology Paths to Global Climate Stability: Energy for a Greenhouse PlanetScience, 2002
- Recent Developments in High-Energy Density Liquid Hydrocarbon FuelsEnergy & Fuels, 1999